Property '' not found on object of type 'id'

Question

I\'m getting Property \'aVariable\' not found on object of type id when trying to read or write aVariable to the array. Shouldn\'t it be known

Answer 1

-[NSArray objectAtIndex:] returns an id pointer. Since id does not contain information about your protocol the compiler cannot know the object has this property you declared; that is why it complains.

You can solve this by either cast the return value of objectAtIndex: or by using the getter/setter notation, i.e. [anArray objectAtIndex:0] setAVariable:...]. Also make sure you import your protocol definition, otherwise the compiler might also not know about the declared method and issue a warning.